Project 2. MIPS Simulator

Skeleton developed by CMU, modified for KAIST CS311 purpose by THKIM.

Instructions

There are three functions you need to implement, located in the following two files: parse.c, run.c

1. parse.c

Implement the following parsing functions.

instruction parsing_instr(const char* buffer, int index)
void parsing_data(const char* buffer, int index)

The parsing_instr() function is called for every instruction in the input file, and converts them into the instruction type. The instruction type is defined in util.h

The parsing_data() function is called for every data field in the input file, and you need to fill the data into the simulated memory. Use the mem_read_32 and mem_write_32 as mentioned in the Hints section below.

There is a helper function you can use to convert binary strings to int (32bit) variables:

int fromBinary(char * s)

2. run.c

Implement the following function:

void process_instruction()

The process_instruction() function is used by the cycle() instruction to execute the instruction at the current PC. Your internal register/memory state should be changed according to the instruction that is pointed to by the current PC.

Hints

• Always use the mem_read_32(), mem_write32() functions when trying to read or write from the simulated memory. This includes your implementation of the load/store functions, but also when you are loading data region to the simulated memory.
• You may generate input files of very simple instructions to check the functionality of your simulator. For example, add $1, $1, 5. Then you can check if the R1 of your simulator has been incremented by 5, etc..
• To compare your results to the reference simulator of the TAs that will be used to grade your simulator, execute make test.